Run dokkaHtml before MkDocs deploying

Author: Goooler

.github/workflows/deploy.yml

@@ -14,4 +14,9 @@ jobs:
         with:
           # Fetch all tags and branches, so that MkDocs could push incremental updates.
           fetch-depth: 0
+      - uses: gradle/actions/setup-gradle@v4
+        with:
+          cache-read-only: true
+      # Prepare API documentations for MkDocs.
+      - run: ./gradlew dokkaHtml --no-configuration-cache
       - uses: ./.github/actions/deploy-site